// 外边框
@for $i from 0 through 20 {
  .mt-#{$i} {
    margin-top: #{$i}px;
  }

  .mr-#{$i} {
    margin-right: #{$i}px;
  }

  .mb-#{$i} {
    margin-bottom: #{$i}px;
  }

  .ml-#{$i} {
    margin-left: #{$i}px;
  }

  .m-#{$i} {
    margin: #{$i}px;
  }
}

// 内边框
@for $i from 0 through 20 {
  .pt-#{$i} {
    padding-top: #{$i}px;
  }

  .pr-#{$i} {
    padding-right: #{$i}px;
  }

  .pb-#{$i} {
    padding-bottom: #{$i}px;
  }

  .pl-#{$i} {
    padding-left: #{$i}px;
  }
}

.opacity-0 {
  opacity: 0;
}

.h-full {
  height: 100%;
}

.w-full {
  width: 100%;
}

.relative {
  position: relative;
}

.flex-col {
  flex-direction: column;
}

.fixed-center {
  position: fixed;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.flex {
  display: flex;
}

.flex-center {
  display: flex;
  justify-content: center;
  align-items: center;
}

.justify-center {
  justify-content: center;
}

.items-center {
  align-items: center;
}

.justify-between {
  justify-content: space-between;
}

.justify-evenly {
  justify-content: space-evenly;
}